Printable Hard Sudoku

Set 1wb5es7. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
2 1 5 9 3
3 7 5
8 4 6 7 1
1 6 7
7 4 2
8 5
2 3 9 7
3 1 6 4
Hard #2
1 8 6 9
9 2 8 7
5 1 6
8 5 7
7 3
2 5 4 8 1
3 2
9 5
9 5 7 3
Hard #3
9 4 5 1
5 3 2
3
4
8 1 5 7 9
4 7 8
2 7 6 4
9 3
8 9 3 5 6 7
Hard #4
3 8 4 7
2 9
5 3
5 4 1
8 2 6 9
1 9 7 4
8 9 1
7 4 5
3 2 8 9
Hard #5
7 9 3
4 7 1 9 6
2 5 3
6 9
8 1 2 6
7 1 4 8
2 3 6
9 7
9 8 2
Hard #6
1 7
1 8 3 5
5 6 2 1
6 3 9
8 5 4
9 3 4 2
6 2 7
3 2 8
6 1 7
Hard #7
2 8 7 4
3 8 6
7 1 8 3
9 8 6
3 4
6 9 3 7
1 9
4 9 2 7
8 6 2
Hard #8
8 4
6 7 2
9 1
2 4 3
4 5 6
1 7 8
9 4 3
5 4 2 7
3 9 6 5 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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